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Producion of intense focused ion beams in a spherical magnetically insulated diode

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3 Author(s)
Greenspan, M.A. ; Laboratory of Plasma Studies, Cornell University, Ithaca, New York 14853 ; Hammer, D.A. ; Sudan, R.N.

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A magnetically insulated ion diode has been constructed with a spherically focusing geometry. The diode has been operated at voltages of ∼250 and ∼500 kV, with impedances adjusted to 2–3 and 7–10 Ω, respectively. The pulse length was ∼85 ns. Total ion currents were ?30% of the diode current. In the high‐voltage case, a focal current density of 2100 A/cm2 was obtained; this is ≳90 times the anode ion current density. Auxilliary magnetic fields were used to steer the beam, with the beam deflection as calculated for a single proton. The diode design and diagnostic techniques are described, as well as possibilities for improvements suggested by our data.

Published in:

Journal of Applied Physics  (Volume:50 ,  Issue: 5 )